Who is responsible for stolen items in valet? I had a iPad stolen from my car and no one will confess.

Make a Police report. If management can't get it straightened out for you.

Right. You should go to management but go to the top! Maybe you should contact Hilton International? They wouldn't appreciate that sort of thing getting out. It's a PR concern for them. They'd probably buy you a new one at least!

No one... Its a 3rd party company, but i would still can Hilton management

Not sure myself.